FYI, the gosolr option is not “rent to own” - it is closer to “solar as a service” business model.
You contract (for what I assume is a minimum of 24 months) for the particular size system you want (looks like they have 2 system offerings). They install and you give them R1500 (for their smaller system) or whatever per month until you give notice and cancel the contract. Monthly fee escalates annually based on the vague concept of “tied to CPI”.
You do NOT become owner of the installed system - EVER - unless you buy out of the contract (price for the buy-out looks to be about 150% of what the system component cost would be if installed from scratch).